Can actors rise to the challenge and play their roles for real? The Thermians are counting on it, having studied the "historical documents" of the Galaxy Quest TV show, and their hero worship (not to mention their taste for Monte Cristo sandwiches) is ultimately proven worthy, with the help of some Galaxy geeks on planet Earth. And while Galaxy Quest serves up great special effects and impressive Stan Winston creatures, director Dean Parisot (Home Fries) is never condescending, lending warm acceptance to this gentle send-up of sci-fi TV and the phenomenon of fandom. Best of all is the splendid cast, including Sigourney Weaver as buxom blonde Gwen DeMarco; Alan Rickman as frustrated thespian Alexander Dane; Tony Shalhoub as dimwit Fred Kwan; Daryl Mitchell as former child-star Tommy Webber; and Enrico Colantoni as Thermian leader Mathesar, whose sing-song voice is a comedic coup de grâce. --Jeff Shannon